bridge_softmix.c: Restored softmix_bridge_leave() shortcut exit.

Change-Id: I13026cd90954e0265eab94a0faf635a3e11f0e35

bridges/bridge_softmix.c

@@ -786,17 +786,17 @@ static void softmix_bridge_leave(struct ast_bridge *bridge, struct ast_bridge_ch
 {
 	struct softmix_channel *sc;
 	struct softmix_bridge_data *softmix_data;
+
 	softmix_data = bridge->tech_pvt;
 	sc = bridge_channel->tech_pvt;
+	if (!sc) {
+		return;
+	}
 
 	if (bridge->softmix.video_mode.mode == AST_BRIDGE_VIDEO_MODE_SFU) {
 		sfu_topologies_on_leave(bridge_channel, &bridge->channels);
 	}
 
-	if (!sc) {
-		return;
-	}
-
 	if (bridge->softmix.binaural_active) {
 		if (sc->binaural) {
 			set_binaural_data_leave(&softmix_data->convolve, sc->binaural_pos,